Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Activated everyone's Fatal Drive.
Created a bottle with Gathering Synthesizer Level 51.
Obtained all recipes.
Obtained the Revelation Book.
Completed requests to get Peter to interview you.
Wrote a record of every exploration.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Defeated the Queen of Shadows.
Got Ryza's battle level to 50.
Defeated all 5 Great Elements.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Found and installed all Power Reactors.
Found all treasure chests.
Wrote a record of one exploration.
Defeated the King of Storms.
Entered the Kurken Bunker.
Became a Braver.
Saved the goat you met on your travels.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Installed the Multiplicauldron at the secret hideout.
Defeated the Mirage Master.
Defeated the Eternal Sculpture.
Defeated the Savage Assassin.
Defeated the Shining Puni.
Helped Empel regain his former strength.
Spent the night camping in the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Laid eyes on the Underworld.
Learned about the history of Ryza and the others.
Helped create Rasen Pudding.
Found one treasure chest.
Created the Bug Net.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Fishing Rod.
Created the Hammer.
Built a secret hideout for everyone.
Witnessed the rise of a strange beast.
Attended a tea party with Ryza and Klaudia.
Created the Woodcutter's Axe.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.